I opened a bug task for Launchpad itself. I also picked the Czech .mo file, which was stripped during the build of gnome-shell, and uncompiled it. And indeed it includes msgstr[2] entries.
** Attachment added: "gnome-shell.po" https://bugs.launchpad.net/launchpad/+bug/1756547/+attachment/5083284/+files/gnome-shell.po -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1756547 Title: Some strings cannot be translated because of an error To manage notifications about this bug go to: https://bugs.launchpad.net/launchpad/+bug/1756547/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs